T3 and T4 Test (Thyroid Hormone Panel)

The T3 and T4 Test at Pamel Laboratories provides a comprehensive evaluation of thyroid hormone levels by measuring both Triiodothyronine (T3) and Thyroxine (T4) in your blood. These hormones are produced by the thyroid gland and play a crucial role in regulating your metabolism, heart rate, temperature control, and energy balance.

This test is essential for diagnosing thyroid disorders, including hyperthyroidism, hypothyroidism, and thyroid hormone imbalances. It is commonly ordered with a TSH (Thyroid Stimulating Hormone) test for complete thyroid function assessment.

What the Test Measures:

• T3 (Triiodothyronine): Active thyroid hormone that regulates metabolism

• T4 (Thyroxine): Precursor hormone converted to T3 in the body

Purpose of the Test:

• Diagnose or monitor:

  • Hyperthyroidism (overactive thyroid)

  • Hypothyroidism (underactive thyroid)

  • Thyroid hormone therapy effectiveness

• Evaluate symptoms such as:

  • Weight changes

  • Fatigue or insomnia

  • Hair and skin changes

  • Palpitations or mood swings

• Monitor thyroid status in pregnancy or autoimmune conditions

Sample Type: Blood sample (serum)
Fasting Required: No
Turnaround Time: 24–48 hours

Interpretation Guide:

• High T3 and/or T4: May indicate hyperthyroidism or thyroid hormone overdose

• Low T3 and/or T4: May suggest hypothyroidism, pituitary dysfunction, or illness-related suppression

Best interpreted with TSH for accurate diagnosis